格式说明符%Lf为`long double`变量给出错误 [英] Format specifier %Lf is giving errors for `long double` variables
问题描述
我遇到以下错误:
In function 'main':
[Warning] unknown conversion type character 'L' in format [-Wformat=]
[Warning] too many arguments for format [-Wformat-extra-args]
In function 'error_user':
[Warning] unknown conversion type character 'L' in format [-Wformat=]
[Warning] too many arguments for format [-Wformat-extra-args]
在下面的代码中:
#include <stdio.h>
#include <stdlib.h>
void error_user (long double *error);
int main(void)
{
long double error;
printf("What error do you want?\n");
error_user (&error);
printf("%Lf\n", error);
return 0;
}
void error_user (long double *error)
{
scanf("%Lf", error);
}
据我所知,long double
的格式说明符为%Lf
,因此不确定如何解决该问题.谢谢!
As far as I know the format specifier of a long double
is %Lf
so not really sure how to solve this one. Thank you!
在 DEV-C ++ 中与TDM-GCC 4.9.2 64-bit Release
一起编译.
推荐答案
您的编译器无法识别%Lf
,您需要提供编译器标志-D__USE_MINGW_ANSI_STDIO=1
Your compiler doesn't recognize %Lf
, you need to provide the compiler flag -D__USE_MINGW_ANSI_STDIO=1
示例:
$ gcc filename.c -Wall -Wextra -pedantic -O3 -D__USE_MINGW_ANSI_STDIO=1
^^^^^^^^^^^^^^^^^^^^^^^^^^
在使用Dev-C++
时,您可能还应该添加-std=c11
标志以启用C11标准.
As you are using Dev-C++
, you should probably also add -std=c11
flag to enable C11 standard.
此线程说明了应如何将标志添加到Dev-C++
:
This thread explains how you should add flags to Dev-C++
:
如何将模式从Dev-C ++中的c ++ 98模式更改为支持C ++ 0x的模式(基于)?
因此,您需要使用链接线程中的指令添加标志-std=c11
和-D__USE_MINGW_ANSI_STDIO=1
.
So you need to add the flags -std=c11
and -D__USE_MINGW_ANSI_STDIO=1
using the instructions in the linked thread.
由于Dev-C ++使用的是较旧的标准,因此仅添加-std=c11
即可解决此问题.先尝试一下.
Since Dev-C++ uses an older standard, it's possible that adding only -std=c11
can solve the issue. Try it first.
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